• The sight of Ronaldo facing United for the first time since his departure adds another layer of intrigue to a contest pairing clubs who have met in four previous European Cup ties – with the winners going on to lift the trophy on three occasions.

• Madrid came out on top in three of the clubs’ four previous encounters – in the semi-finals in 1956-57 and quarter-finals in 1999-2000 and 2002-03 – with United prevailing in the 1967/-8 semi-finals.